Mentoring dates back to Greek mythology with reference to the sharing of wisdom of knowledge and experience. In Hong Kong, mentorship has been a hallmark of the professional development of the teacher-librarians. Following a literature review on mentoring in librarianship, this paper provides an overview highlighting the mentorship development among teacher-librarians in Hong Kong. A discussion on how mentorship shaped the preparation of teacher-librarians leads to an analysis of four issues: (1) a formalized mentoring framework; (2) a systematical approach to observe and assess the impact; (3) training to enhance the competency of teacher-librarians; and (4) re-thinking the commitment to evidence-based practice. While there are complex issues facing the teacher-librarian profession, the author invites the teacher-training institutes to explore their role and participation in facilitating the advancement of teacher-librarianship in Hong Kong which is a pivotal component to nurture information-literate learners for the purpose of knowledge building.